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Stopper device for grinding stone cover of grinder

a technology of stopper device and grinder, which is applied in the direction of metal-working equipment, portable grinding machines, manufacturing tools, etc., can solve the problems of affecting usability, affecting the efficiency of operation, and affecting the function of dust scattering prevention, so as to prevent dust from scattering, improve operation efficiency, and effectively prevent the effect of dust scattering towards the user

Active Publication Date: 2013-03-26
MAKITA CORP
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Benefits of technology

The invention described in this patent text is a stopper device for a grinding machine that prevents dust and debris from scattering towards the user while improving operability. The device allows the grinding stone cover to be positioned at a most suitable position in relation to the spindle by adjusting its position in the gear housing. The device restricts the position adjustment range to a predetermined range, preventing the user from accidentally or intentionally positioning the grinding stone cover in a way that compromises its ability to prevent dust scattering. The device also includes a stopper abutting portion that securely restricts the position adjustment range and prevents the grinding stone cover from being positioned in a way that impairs its ability to prevent dust scattering. The device is easy to apply to existing grinders and ensures the dust scattering prevention function is effective in relation to the mode of operation. Additionally, the device prevents the stopper protrusion from being removed in the spindle axis direction by restricting its displacement, further restricting the opening angle of the grinding stone cover from its reference position.

Problems solved by technology

However, this kind of grinding stone cover has accompanied the following problems.
As described above, because it is constructed to enable the position of the grinding stone to change about an axis of the spindle to an arbitrary position by loosening a fixing screw, a problem may be caused that cutting chips scatter towards a user if the position is adjusted, when it is opened toward the user at a large angle, and therefore, the construction for enabling the position to be changed to an arbitrary position (a position adjustment function) may rather impair the usability from a viewpoint of prevention of dust from scattering.
Further, if the tightening of the fixing screw after the positional adjustment is weak, the grinding stone cover may, for example, contact the other parts so that the position may be largely displaced in an opening direction, resulting to bring it into a condition so that the a dust scattering prevention function is impaired in some cases.
Further, because the position changeable range of the grinding stone cover in the rotational direction of the grinding stone is restricted to a predetermined range by the stopper device, the user may not adjust the position by mistake to a position wherein the dust scattering prevention function may be substantially impaired, and even in the case that the grinding stone cover has contacted the other parts, the grinding stone cover may not accidentally move to a position where the dust scattering prevention function may be substantially impaired.

Method used

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  • Stopper device for grinding stone cover of grinder
  • Stopper device for grinding stone cover of grinder
  • Stopper device for grinding stone cover of grinder

Examples

Experimental program
Comparison scheme
Effect test

first embodiment

[0026]Next, embodiments of the present invention will be described with reference to FIGS. 1 to 11. FIG. 1 shows a grinder 1 having a stopper device T1 according to a A fundamental construction of the grinder 1 needs no particular change for this embodiment, however, it will be briefly described below. A left side in FIG. 1 will be referred to as a front side of the grinder 1 and a right side will be referred to as a rear side.

[0027]The grinder 1 includes a main body portion 3 and a speed reduction gear portion 4. The main body portion 3 includes a main body housing 5 having a substantially cylindrical configuration. An electric motor 2 serving as a power source is received within the main body housing 5. The main body housing 5 and the main body portion 3 also serve as a grip portion having such a thickness that allows a user to easily hold it. The user may be positioned on a rear side of the main body portion 3 to hold the main body portion 3. A main switch 6 of a slide operation...

second embodiment

[0049]The stopper abutting portion 31 is provided in a state of entering the movement path of both fixing screw tightening portions 22a, 22b in accordance with the rotation of the grinding stone cover 30 in the rotational direction of the grinding stone. Therefore, when the position of the shielded range for the grinding stone 10 is adjusted by rotating the grinding stone cover 30 in the rotational direction of the grinding stone, further rotation is prevented as the leading end portion of the fixing screw tightening portion 22a or the fixing screw 24 abuts the stopper abutting portion 31. In the second embodiment as well, the position adjustable range of the grinding stone cover 30 in the rotational direction of the grinding stone is restricted to the opening angle θ that is 60 degrees at the maximum from the reference position S.

[0050]As described above, according to the stopper device T2 of the second embodiment, the same operation and effects can be obtained as of the first embo...

third embodiment

[0056]Also, the bent portion 40a is provided on an upper portion of the stopper fitting 40 of the The bent portion 40a extends along over the upper side of the stopper main body 31a. With the bent portion 40a, the upward displacement of the stopper projection 41 abutted to the stopper main portion 31a is restricted so that its removal is prevented, and therefore, the position adjustable range restricting function of the stopper device T3 can be reliably exercised because the abutting condition can be reliably maintained.

[0057]The additional modifications may be respectively made to the above-described third embodiment. For example, as shown in FIG. 11, the opening angle θ of the grinding stone cover 20 can be reliably restricted by providing a stopper restricting protrusion 28 in a position adjacent to the stopper projection 27 of the first embodiment. Similar to the removal preventing protrusion 22d, the stopper restricting protrusion 28 is provided on the inner circumferential su...

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Abstract

A grinder can include a stopper projection provided to a grinding stone cover and position a stopper abutting portion on a side of a gear housing in order to restrict a position adjustable range through abutment of the stopper projection to the stopper abutting portion in a position where the grinding stone cover has rotated in a rotational direction of the grinding stone by a set angle.

Description

TECHNICAL FIELD[0001]The present invention relates to a stopper device for a grinding stone cover of a hand-held grinder, which is used, for example, for grinding materials such as stones.BACKGROUND ART[0002]A hand-held grinder has a main body portion having a substantially cylindrical body shape that receives an electric motor therein, the main body portion is used as a grip portion, which is held by a user for a grinding operation, etc. A speed reduction portion is provided at a front portion of the main body portion for reducing the rotational output of the electric motor by a bevel gear train and outputting it in a perpendicular direction. For this purpose, a spindle on an output side of the speed reduction portion extends perpendicular to a motor shaft. A circular grinding stone (wheel) is attached to the spindle. In general, a substantially semi-circumferential range on a rear side of the grinding stone (a user side) is covered with a cover for preventing powder dust or the li...

Claims

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Application Information

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Patent Type & Authority Patents(United States)
IPC IPC(8): B24B23/00
CPCB24B55/052B24B23/028
Inventor NUMATA, FUMITOSHIKIMATA, HIROKAZU
Owner MAKITA CORP
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